Food grade starch resistant to alpha-amylase

A - Human Necessities – 21 – D

Patent

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Details

A21D 13/00 (2006.01) A21D 2/18 (2006.01) A23L 1/0522 (2006.01) C08B 31/00 (2006.01) C08B 31/06 (2006.01)

Patent

CA 2293537

Chemically modified RS4 starches are provided which have a high degree of resistance to .alpha.-amylase digestion and can serve as low calorie food additives in products such as breads or crackers as a source of dietary fiber. The starches of the invention can be prepared from any type of starting starch (e.g., wheat, corn, oat, rice, tapioca, mung bean, potato or high amylose starches) and are preferably formed as phosphorylated distarch phosphodiesters. The preferred phosphorylating agent is a mixture of sodium trimetaphosphate (STMP) and sodium tripolyphosphate (STPP) in the presence of sodium chloride or sulfate. The starches are advantageously prepared in an aqueous slurry reaction at basic pH and moderate heating.

Cette invention concerne des amidons RS¿4? modifiés chimiquement, lesquels possèdent un taux de résistance élevé à la digestion par les .alpha.-amylases. Ces amidons peuvent être utilisés en qualité d'additifs alimentaires à faible teneur en calories dans des produits tels que du pain ou des biscottes, et jouer le rôle de source de fibres diététiques. Ces amidons peuvent être préparés à partir de n'importe quel type d'amidon de base (par exemple du blé, du maïs, de l'avoine, du riz, du tapioca, de l'ambérique, des pommes de terre ou des amidons riches en amylose), et sont de préférence obtenus sous forme de phosphodiesters de diamidon phosphorylés. L'agent de phosphorylation préféré consiste en un mélange de trimetaphosphate de sodium (STMP) et de tripolyphosphate de sodium (STPP) en présence de sulfate ou de chlorure de sodium. Ces amidons peuvent être avantageusement préparés en faisant réagir une bouillie aqueuse à un pH basique et en effectuant un chauffage modéré.

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